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  • Rank 26,271 (Top 0.6 %)
  • Language
    JavaScript
  • License
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  • Created about 11 years ago
  • Updated 4 months ago

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Repository Details

The buffer module from node.js, for the browser.

buffer ci npm downloads javascript style guide

The buffer module from node.js, for the browser.

saucelabs

With browserify, simply require('buffer') or use the Buffer global and you will get this module.

The goal is to provide an API that is 100% identical to node's Buffer API. Read the official docs for the full list of properties, instance methods, and class methods that are supported.

features

  • Manipulate binary data like a boss, in all browsers!
  • Super fast. Backed by Typed Arrays (Uint8Array/ArrayBuffer, not Object)
  • Extremely small bundle size (6.75KB minified + gzipped, 51.9KB with comments)
  • Excellent browser support (Chrome, Firefox, Edge, Safari 11+, iOS 11+, Android, etc.)
  • Preserves Node API exactly
  • Square-bracket buf[4] notation works!
  • Does not modify any browser prototypes or put anything on window
  • Comprehensive test suite (including all buffer tests from node.js core)

install

To use this module directly (without browserify), install it:

npm install buffer

This module was previously called native-buffer-browserify, but please use buffer from now on.

If you do not use a bundler, you can use the standalone script.

usage

The module's API is identical to node's Buffer API. Read the official docs for the full list of properties, instance methods, and class methods that are supported.

As mentioned above, require('buffer') or use the Buffer global with browserify and this module will automatically be included in your bundle. Almost any npm module will work in the browser, even if it assumes that the node Buffer API will be available.

To depend on this module explicitly (without browserify), require it like this:

var Buffer = require('buffer/').Buffer  // note: the trailing slash is important!

To require this module explicitly, use require('buffer/') which tells the node.js module lookup algorithm (also used by browserify) to use the npm module named buffer instead of the node.js core module named buffer!

how does it work?

The Buffer constructor returns instances of Uint8Array that have their prototype changed to Buffer.prototype. Furthermore, Buffer is a subclass of Uint8Array, so the returned instances will have all the node Buffer methods and the Uint8Array methods. Square bracket notation works as expected -- it returns a single octet.

The Uint8Array prototype remains unmodified.

tracking the latest node api

This module tracks the Buffer API in the latest (unstable) version of node.js. The Buffer API is considered stable in the node stability index, so it is unlikely that there will ever be breaking changes. Nonetheless, when/if the Buffer API changes in node, this module's API will change accordingly.

related packages

conversion packages

convert typed array to buffer

Use typedarray-to-buffer to convert any kind of typed array to a Buffer. Does not perform a copy, so it's super fast.

convert buffer to typed array

Buffer is a subclass of Uint8Array (which is a typed array). So there is no need to explicitly convert to typed array. Just use the buffer as a Uint8Array.

convert blob to buffer

Use blob-to-buffer to convert a Blob to a Buffer.

convert buffer to blob

To convert a Buffer to a Blob, use the Blob constructor:

var blob = new Blob([ buffer ])

Optionally, specify a mimetype:

var blob = new Blob([ buffer ], { type: 'text/html' })

convert arraybuffer to buffer

To convert an ArrayBuffer to a Buffer, use the Buffer.from function. Does not perform a copy, so it's super fast.

var buffer = Buffer.from(arrayBuffer)

convert buffer to arraybuffer

To convert a Buffer to an ArrayBuffer, use the .buffer property (which is present on all Uint8Array objects):

var arrayBuffer = buffer.buffer.slice(
  buffer.byteOffset, buffer.byteOffset + buffer.byteLength
)

Alternatively, use the to-arraybuffer module.

performance

See perf tests in /perf.

BrowserBuffer is the browser buffer module (this repo). Uint8Array is included as an additional check (since BrowserBuffer uses Uint8Array under the hood, Uint8Array will always be at least a bit faster). Finally, NodeBuffer is the node.js buffer module, which is included to compare against.

NOTE: Performance has improved since these benchmarks were taken. PR welcome to update the README.

Chrome 38

Method Operations Accuracy Sampled Fastest
BrowserBuffer#bracket-notation 11,457,464 ops/sec ยฑ0.86% 66 โœ“
Uint8Array#bracket-notation 10,824,332 ops/sec ยฑ0.74% 65
BrowserBuffer#concat 450,532 ops/sec ยฑ0.76% 68
Uint8Array#concat 1,368,911 ops/sec ยฑ1.50% 62 โœ“
BrowserBuffer#copy(16000) 903,001 ops/sec ยฑ0.96% 67
Uint8Array#copy(16000) 1,422,441 ops/sec ยฑ1.04% 66 โœ“
BrowserBuffer#copy(16) 11,431,358 ops/sec ยฑ0.46% 69
Uint8Array#copy(16) 13,944,163 ops/sec ยฑ1.12% 68 โœ“
BrowserBuffer#new(16000) 106,329 ops/sec ยฑ6.70% 44
Uint8Array#new(16000) 131,001 ops/sec ยฑ2.85% 31 โœ“
BrowserBuffer#new(16) 1,554,491 ops/sec ยฑ1.60% 65
Uint8Array#new(16) 6,623,930 ops/sec ยฑ1.66% 65 โœ“
BrowserBuffer#readDoubleBE 112,830 ops/sec ยฑ0.51% 69 โœ“
DataView#getFloat64 93,500 ops/sec ยฑ0.57% 68
BrowserBuffer#readFloatBE 146,678 ops/sec ยฑ0.95% 68 โœ“
DataView#getFloat32 99,311 ops/sec ยฑ0.41% 67
BrowserBuffer#readUInt32LE 843,214 ops/sec ยฑ0.70% 69 โœ“
DataView#getUint32 103,024 ops/sec ยฑ0.64% 67
BrowserBuffer#slice 1,013,941 ops/sec ยฑ0.75% 67
Uint8Array#subarray 1,903,928 ops/sec ยฑ0.53% 67 โœ“
BrowserBuffer#writeFloatBE 61,387 ops/sec ยฑ0.90% 67
DataView#setFloat32 141,249 ops/sec ยฑ0.40% 66 โœ“

Firefox 33

Method Operations Accuracy Sampled Fastest
BrowserBuffer#bracket-notation 20,800,421 ops/sec ยฑ1.84% 60
Uint8Array#bracket-notation 20,826,235 ops/sec ยฑ2.02% 61 โœ“
BrowserBuffer#concat 153,076 ops/sec ยฑ2.32% 61
Uint8Array#concat 1,255,674 ops/sec ยฑ8.65% 52 โœ“
BrowserBuffer#copy(16000) 1,105,312 ops/sec ยฑ1.16% 63
Uint8Array#copy(16000) 1,615,911 ops/sec ยฑ0.55% 66 โœ“
BrowserBuffer#copy(16) 16,357,599 ops/sec ยฑ0.73% 68
Uint8Array#copy(16) 31,436,281 ops/sec ยฑ1.05% 68 โœ“
BrowserBuffer#new(16000) 52,995 ops/sec ยฑ6.01% 35
Uint8Array#new(16000) 87,686 ops/sec ยฑ5.68% 45 โœ“
BrowserBuffer#new(16) 252,031 ops/sec ยฑ1.61% 66
Uint8Array#new(16) 8,477,026 ops/sec ยฑ0.49% 68 โœ“
BrowserBuffer#readDoubleBE 99,871 ops/sec ยฑ0.41% 69
DataView#getFloat64 285,663 ops/sec ยฑ0.70% 68 โœ“
BrowserBuffer#readFloatBE 115,540 ops/sec ยฑ0.42% 69
DataView#getFloat32 288,722 ops/sec ยฑ0.82% 68 โœ“
BrowserBuffer#readUInt32LE 633,926 ops/sec ยฑ1.08% 67 โœ“
DataView#getUint32 294,808 ops/sec ยฑ0.79% 64
BrowserBuffer#slice 349,425 ops/sec ยฑ0.46% 69
Uint8Array#subarray 5,965,819 ops/sec ยฑ0.60% 65 โœ“
BrowserBuffer#writeFloatBE 59,980 ops/sec ยฑ0.41% 67
DataView#setFloat32 317,634 ops/sec ยฑ0.63% 68 โœ“

Safari 8

Method Operations Accuracy Sampled Fastest
BrowserBuffer#bracket-notation 10,279,729 ops/sec ยฑ2.25% 56 โœ“
Uint8Array#bracket-notation 10,030,767 ops/sec ยฑ2.23% 59
BrowserBuffer#concat 144,138 ops/sec ยฑ1.38% 65
Uint8Array#concat 4,950,764 ops/sec ยฑ1.70% 63 โœ“
BrowserBuffer#copy(16000) 1,058,548 ops/sec ยฑ1.51% 64
Uint8Array#copy(16000) 1,409,666 ops/sec ยฑ1.17% 65 โœ“
BrowserBuffer#copy(16) 6,282,529 ops/sec ยฑ1.88% 58
Uint8Array#copy(16) 11,907,128 ops/sec ยฑ2.87% 58 โœ“
BrowserBuffer#new(16000) 101,663 ops/sec ยฑ3.89% 57
Uint8Array#new(16000) 22,050,818 ops/sec ยฑ6.51% 46 โœ“
BrowserBuffer#new(16) 176,072 ops/sec ยฑ2.13% 64
Uint8Array#new(16) 24,385,731 ops/sec ยฑ5.01% 51 โœ“
BrowserBuffer#readDoubleBE 41,341 ops/sec ยฑ1.06% 67
DataView#getFloat64 322,280 ops/sec ยฑ0.84% 68 โœ“
BrowserBuffer#readFloatBE 46,141 ops/sec ยฑ1.06% 65
DataView#getFloat32 337,025 ops/sec ยฑ0.43% 69 โœ“
BrowserBuffer#readUInt32LE 151,551 ops/sec ยฑ1.02% 66
DataView#getUint32 308,278 ops/sec ยฑ0.94% 67 โœ“
BrowserBuffer#slice 197,365 ops/sec ยฑ0.95% 66
Uint8Array#subarray 9,558,024 ops/sec ยฑ3.08% 58 โœ“
BrowserBuffer#writeFloatBE 17,518 ops/sec ยฑ1.03% 63
DataView#setFloat32 319,751 ops/sec ยฑ0.48% 68 โœ“

Node 0.11.14

Method Operations Accuracy Sampled Fastest
BrowserBuffer#bracket-notation 10,489,828 ops/sec ยฑ3.25% 90
Uint8Array#bracket-notation 10,534,884 ops/sec ยฑ0.81% 92 โœ“
NodeBuffer#bracket-notation 10,389,910 ops/sec ยฑ0.97% 87
BrowserBuffer#concat 487,830 ops/sec ยฑ2.58% 88
Uint8Array#concat 1,814,327 ops/sec ยฑ1.28% 88 โœ“
NodeBuffer#concat 1,636,523 ops/sec ยฑ1.88% 73
BrowserBuffer#copy(16000) 1,073,665 ops/sec ยฑ0.77% 90
Uint8Array#copy(16000) 1,348,517 ops/sec ยฑ0.84% 89 โœ“
NodeBuffer#copy(16000) 1,289,533 ops/sec ยฑ0.82% 93
BrowserBuffer#copy(16) 12,782,706 ops/sec ยฑ0.74% 85
Uint8Array#copy(16) 14,180,427 ops/sec ยฑ0.93% 92 โœ“
NodeBuffer#copy(16) 11,083,134 ops/sec ยฑ1.06% 89
BrowserBuffer#new(16000) 141,678 ops/sec ยฑ3.30% 67
Uint8Array#new(16000) 161,491 ops/sec ยฑ2.96% 60
NodeBuffer#new(16000) 292,699 ops/sec ยฑ3.20% 55 โœ“
BrowserBuffer#new(16) 1,655,466 ops/sec ยฑ2.41% 82
Uint8Array#new(16) 14,399,926 ops/sec ยฑ0.91% 94 โœ“
NodeBuffer#new(16) 3,894,696 ops/sec ยฑ0.88% 92
BrowserBuffer#readDoubleBE 109,582 ops/sec ยฑ0.75% 93 โœ“
DataView#getFloat64 91,235 ops/sec ยฑ0.81% 90
NodeBuffer#readDoubleBE 88,593 ops/sec ยฑ0.96% 81
BrowserBuffer#readFloatBE 139,854 ops/sec ยฑ1.03% 85 โœ“
DataView#getFloat32 98,744 ops/sec ยฑ0.80% 89
NodeBuffer#readFloatBE 92,769 ops/sec ยฑ0.94% 93
BrowserBuffer#readUInt32LE 710,861 ops/sec ยฑ0.82% 92
DataView#getUint32 117,893 ops/sec ยฑ0.84% 91
NodeBuffer#readUInt32LE 851,412 ops/sec ยฑ0.72% 93 โœ“
BrowserBuffer#slice 1,673,877 ops/sec ยฑ0.73% 94
Uint8Array#subarray 6,919,243 ops/sec ยฑ0.67% 90 โœ“
NodeBuffer#slice 4,617,604 ops/sec ยฑ0.79% 93
BrowserBuffer#writeFloatBE 66,011 ops/sec ยฑ0.75% 93
DataView#setFloat32 127,760 ops/sec ยฑ0.72% 93 โœ“
NodeBuffer#writeFloatBE 103,352 ops/sec ยฑ0.83% 93

iojs 1.8.1

Method Operations Accuracy Sampled Fastest
BrowserBuffer#bracket-notation 10,990,488 ops/sec ยฑ1.11% 91
Uint8Array#bracket-notation 11,268,757 ops/sec ยฑ0.65% 97
NodeBuffer#bracket-notation 11,353,260 ops/sec ยฑ0.83% 94 โœ“
BrowserBuffer#concat 378,954 ops/sec ยฑ0.74% 94
Uint8Array#concat 1,358,288 ops/sec ยฑ0.97% 87
NodeBuffer#concat 1,934,050 ops/sec ยฑ1.11% 78 โœ“
BrowserBuffer#copy(16000) 894,538 ops/sec ยฑ0.56% 84
Uint8Array#copy(16000) 1,442,656 ops/sec ยฑ0.71% 96
NodeBuffer#copy(16000) 1,457,898 ops/sec ยฑ0.53% 92 โœ“
BrowserBuffer#copy(16) 12,870,457 ops/sec ยฑ0.67% 95
Uint8Array#copy(16) 16,643,989 ops/sec ยฑ0.61% 93 โœ“
NodeBuffer#copy(16) 14,885,848 ops/sec ยฑ0.74% 94
BrowserBuffer#new(16000) 109,264 ops/sec ยฑ4.21% 63
Uint8Array#new(16000) 138,916 ops/sec ยฑ1.87% 61
NodeBuffer#new(16000) 281,449 ops/sec ยฑ3.58% 51 โœ“
BrowserBuffer#new(16) 1,362,935 ops/sec ยฑ0.56% 99
Uint8Array#new(16) 6,193,090 ops/sec ยฑ0.64% 95 โœ“
NodeBuffer#new(16) 4,745,425 ops/sec ยฑ1.56% 90
BrowserBuffer#readDoubleBE 118,127 ops/sec ยฑ0.59% 93 โœ“
DataView#getFloat64 107,332 ops/sec ยฑ0.65% 91
NodeBuffer#readDoubleBE 116,274 ops/sec ยฑ0.94% 95
BrowserBuffer#readFloatBE 150,326 ops/sec ยฑ0.58% 95 โœ“
DataView#getFloat32 110,541 ops/sec ยฑ0.57% 98
NodeBuffer#readFloatBE 121,599 ops/sec ยฑ0.60% 87
BrowserBuffer#readUInt32LE 814,147 ops/sec ยฑ0.62% 93
DataView#getUint32 137,592 ops/sec ยฑ0.64% 90
NodeBuffer#readUInt32LE 931,650 ops/sec ยฑ0.71% 96 โœ“
BrowserBuffer#slice 878,590 ops/sec ยฑ0.68% 93
Uint8Array#subarray 2,843,308 ops/sec ยฑ1.02% 90
NodeBuffer#slice 4,998,316 ops/sec ยฑ0.68% 90 โœ“
BrowserBuffer#writeFloatBE 65,927 ops/sec ยฑ0.74% 93
DataView#setFloat32 139,823 ops/sec ยฑ0.97% 89 โœ“
NodeBuffer#writeFloatBE 135,763 ops/sec ยฑ0.65% 96

Testing the project

First, install the project:

npm install

Then, to run tests in Node.js, run:

npm run test-node

To test locally in a browser, you can run:

npm run test-browser-old-local # For ES5 browsers that don't support ES6
npm run test-browser-new-local # For ES6 compliant browsers

This will print out a URL that you can then open in a browser to run the tests, using airtap.

To run automated browser tests using Saucelabs, ensure that your SAUCE_USERNAME and SAUCE_ACCESS_KEY environment variables are set, then run:

npm test

This is what's run in Travis, to check against various browsers. The list of browsers is kept in the bin/airtap-es5.yml and bin/airtap-es6.yml files.

JavaScript Standard Style

This module uses JavaScript Standard Style.

JavaScript Style Guide

To test that the code conforms to the style, npm install and run:

./node_modules/.bin/standard

credit

This was originally forked from buffer-browserify.

Security Policies and Procedures

The buffer team and community take all security bugs in buffer seriously. Please see our security policies and procedures document to learn how to report issues.

license

MIT. Copyright (C) Feross Aboukhadijeh, and other contributors. Originally forked from an MIT-licensed module by Romain Beauxis.

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feross-card

It's me, Feross!
JavaScript
24
star
94

vlc-command

Find VLC player command line path
JavaScript
24
star
95

raft

An understandable consensus algorithm
C++
23
star
96

simple-concat

Super-minimalist version of `concat-stream`. Less than 15 lines!
JavaScript
23
star
97

stream-to-blob-url

Convert a Readable Stream to a Blob URL
JavaScript
23
star
98

SuperTranslate

"Super translate" words into many different languages at once
CSS
21
star
99

Fling

Send songs, videos, web urls from your phone to your desktop with a flick of your wrist
Objective-C
21
star
100

detect-proxy

Using <img> to detect whether the user is browsing through a proxy or not.
21
star